Correlation properties of MPEG VBR video sources: relative importance of short and medium term correlation on ATM multiplexer performance

An investigation of correlation properties of MPEG VBR video based on three different video sequences is presented. It is found that the short range properties of these sources resemble those of uncorrelated sources. To investigate the relative importance of short and medium term correlation properties versus the longer term correlation properties of MFEG sources, analytical source models taking into account the periodic properties of the sources are used. Results from these models are compared with trace driven simulations in which long term properties are inherent. One conclusion of this investigation is that for the ATM cell loss probability, interesting regions in terms of buffer capacity and number of sources exist, where long term corTelation properties will not influence multiplexer performance. For a number of 12 multiplexed sources, this region extended to buffer lengths of about 10 times the mean video frame size in high loss regions. In low loss regions, no effect of longer term correlation properties was seen at buffer lengths up to 15 times the mean frame lengths, with the same number of sources.